Wires keeping the launcher up to date with the browser.

ui/aura/window.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/aura/window.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "ui/aura/desktop.h"
@@ skipping 359 matching lines @@
   ui::MultiAnimation* multi_animation = new ui::MultiAnimation(parts);
   multi_animation->set_continuous(false);
   return multi_animation;
 }
 
 internal::RootWindow* Window::GetRoot() {
   return parent_ ? parent_->GetRoot() : NULL;
 }
 
 void Window::SetVisible(bool visible) {
+  if (visible == layer_->visible())
+    return;  // No change.
+
   bool was_visible = IsVisible();
   layer_->SetVisible(visible);
   bool is_visible = IsVisible();
   if (was_visible != is_visible) {
     SchedulePaint();
     if (delegate_)
       delegate_->OnWindowVisibilityChanged(is_visible);
   }
+  FOR_EACH_OBSERVER(WindowObserver, observers_,
+                    OnWindowVisibilityChanged(this, is_visible));
 }
 
 void Window::SchedulePaint() {
   SchedulePaintInRect(gfx::Rect(0, 0, bounds().width(), bounds().height()));
 }
 
 bool Window::StopsEventPropagation() const {
   return stops_event_propagation_ && !children_.empty();
 }
 
@@ skipping 39 matching lines @@
   }
 
   return delegate_ ? this : NULL;
 }
 
 void Window::OnPaintLayer(gfx::Canvas* canvas) {
   delegate_->OnPaint(canvas);
 }
 
 }  // namespace aura